Type Checking

Restore ``user2.c'' to its original form. Notice that the header of the ``LOG2'' function gives the type of the result and the number and types of the arguments. Try some experiments:

• In the main procedure, change one of the calls to LOG2 so that it passes two arguments instead of one. What happens when you compile it?

• In the main procedure, change one of the calls to LOG2 so that it passes zero arguments instead of one. What happens when you compile it?

• In the main procedure, add the statement

     printf(LOG2(5.));
  

  somewhere. What happens when you compile it?

All of these experiments should show you that the compiler warns you when you pass arguments, or use results, in a way incompatible with the declaration of the function.